*4.6. Water Vapor Permeability (WVP)*

The WVP of the film samples was determined by Erdem et al. [33]. The measured WVP of the films was calculated using Equation (3):

$$\text{WaterVaporPermeability} = \frac{\Delta m}{\Delta t \times \Delta P \times A} \times d \tag{3}$$

The above equation involves the representation of ∆*m*/∆*t*, which denotes the amount of moisture gained per unit of time. The variable *A* represents the surface area of the film in square meters. The symbol ∆*P* denotes the disparity in water vapor pressure across the film, measured in kPa. Lastly, the letter *d* signifies the thickness of the film in millimeters.
